.04 Hydraulics. 2500 (See .21.) Thermodynamics. Civil, structural, and architectural engineering. .040 General. .041 Design. .0410 General. Foundations. .05 .06 .07 .0411 .0412 Piers and columns. .0418 Beams and girders. .0414 Trusses and arches. Retaining walls, dams, and sea walls. Miscellaneous. .042 Surveying and drawing. .049 Miscellaneous. Electrical engineering." Mechanical engineeringb Trades and shop practice. .071 Welding and babbitting. .072 Forge and metal work. .079 Miscellaneous. .08 Standards, commercial sizes, and practices. .09 Miscellaneous, 1 Materials (manufacture, tests, strength, preserva .12 Vegetable (material sense only rubber, wood, Cement (concrete, gravel, plaster, sand, etc.). General. Effect of alkali and acids on concrete. .169 Miscellaneous. .17 Oils, petroleum tars, whitewash, (See pounds, paints (asphalts, .18 Compositions and textiles. .19 Miscellaneous (adhesives, etc.). .2 Land development. .2121 Flow in open channels. 2122 Flow through tile, flumes, and pipe. .2123 Flow through culverts. .2124 Flow around bends and piers. This classification key has been officially adopted by the American Society of Agricultural Engineers. U. S. D. A.-10-1-86 Land development-Continued. .21 Hydraulics of irrigation and drainage-Continued. 213 Measurement of water. .22 .23 .214 Storage of water. .215 Losses of water. .2150 General. .2151 .2152 Seepage and percolation. .2159 Miscellaneous. .219 Miscellaneous. Drainage and flood control. .220 General. .2201 Reports on drainage projects. .2203 Statistics. .221 Structures. .2210 General. .2221 Laws. .2222. Contracts and specifications. .2229 Miscellaneous. .223 Effects of drainage. .2230 General. (See .261.) .2231 Subsidence of peat and muck soils. .224 Erosion. .2240 General 2241 Terracing. 2242 Control of gullies. 2249 Miscellaneous als 1 .229 Miscellaneous. Irrigation. 230 General. 2301 Reports on irrigation projects. .2302 Publications on irrigation, .2303 Statistics. .231 Structures. .2310 General. Pipes, flumes, siphons, tunnels. .2317 Farm ditch structures. .2318 T Pumping plants. Miscellaneous. (See .2214 and .35.) .3 Land development-Continued. .23 Irrigation-Continued. .232 Farm practice in applying water. .2321 Preparation of land. .2322 .2323 .2324 Water requirements of crops. .2325 Spray irrigation. .2326 Subirrigation. .2329 Miscellaneous. .233 Sewage irrigation. .234 Effects of irrigation. .2341 Water-logging and alkali. (See .225.) .2342 Economics. Miscellaneous. Soil-moisture investigations. Irrigation organization administration. .2349 .235 .236 .2360 General. .25 .240 General. .241 Removal of trees and stumps. .2410 General. .2411 With mechanical equipment. (See .366.) .2412 With explosives. 2413 By burning. .2414 By poisoning. .2419 .2420 Miscellaneous. .242 Removal of brush. General. .2421 Mechanical means. .2422 With animals. (See .366.) .2423 By chemical treatment. .2429 .243 Miscellaneous. Removal of bowlders. .244 Distillation of stumps. .249 Miscellaneous. Reforestation. .26 Land settlement (colonization). General. Drainage districts. .260 .261 .262 .263 Cut-over lands. Irrigation districts. .269 Miscellaneous. .29 Miscellaneous. Machinery and equipment. .30 General. .301 History. .302 .303 Statistics. Relation of machinery to production. .304 Economics. .3040 General. .3041 Cost. Depreciation. .3049 Miscellaneous. Machine design. .3042 .305 .306 .307 .309 Traction to dynamometer tests. Lubrication. Miscellaneous. U. S. D. A.-10-1-26 .3 Machinery and equipment—Continued. .31 Crop machinery. .310 General, .8101 Statistics. .3102 Duty. .8103 Power requirements. 8104 Manufacturers and catalogues. .3109 Miscellaneous. .311 Tillage machinery. .3110 General. གླུ་མ་ ༈ ༈ .31101 Relation of soil dynamics to tillage. .8111 Plows and ridging devices. .8112 3113 Subsoilers. Harrows and rollers." 8114 Drags, floats, and smoothers. .312 Seeding machinery. .8120 .3121 General. Grain seeders and drills. .3122 Grass seeders and drills. .3123 Corn and cotton planters. .3124 Potato planters." .3125 Beet planters. .3126 Garden seeders. .3127 Transplanters, .3128 Row markers. Grain binders, headers, reapers and com- .3130 .8131 958 3182 .8134 Root-crop diggers and harvesters. .3135 .3133 Mowers, rakes, loaders, and stackers. .3136 Fruit and nut gathering equipment. Shellers, shredders, and cutters. Balers, presses, hay-curing equipment. Cane and juice mills. Dryers and dehydraterson 5 .315 Spraying, dusting, and fumigating machinery. .3 Machinery and equipment Continued. .81 Crop machinery-Continued. .317 Crop loading, elevating, and conveying machinery. .8170 General. .3171 Hay forks and equipment. .319 Miscellaneous. .82 Livestock and dairy machinery. General. .320 .321 .322 Feed grinders and cookers. Clipping, shearing, and cleaning equipment. .323 Veterinary equipment.” .324 Dairy machinery and equipment. .3240 .3241 .3242 .3243 3244 .8245 .8247 General. Milking machines. Sterilizers and washers. Coolers, heaters, and Pasteurizers. Cheese-making equipment. Bottling machines. .3248 Ice cream making. .3249 Miscellaneous. .329 Miscellaneous. .33 Vehicles (for automotive). (See .46.) .339 Miscellaneous. .34 Minor farm tools and equipment. Construction machinery and tools. A .360 General. .861 Excavating and grading equipment. Elevators, loaders, and conveyors. .8617 Dump wagons.,PLI) .3614 .3616 Stone crushers and pulverizers. .364 Woodworking machinery and tools. U. S. D. A.-10-1-26 |